Automatic grinding or polishing machine.



No. 741,907 I P ATENTED 001". 20, 1903.

I A. H. HATFIELD. V

AUTOMATIG'GRINDING 0R POLISHING MACHINE.

. APPLICATION FILED; Mn. 10,1903.

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. A. H. HATFIELD. AUTOMATIC GRINDING 0R POLISHING MACHINE.

7 APPLICATION FILED JAN. 10. 1903. N0 MODEL. 3 SHEETS-SHEBT 3.

No. 741,907. A PATENTED OCT. 20; 1903. H. HATFIELD.

AUTOMATIC GRINDING 0B. POLISHING MACHINE. APPLICATION FILED JAN. 10, 1903.

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" NITED STATES Patented October 20, 1903.

AI IBERT HATFIELD, OF BROOKPORT, NEW YORK.

AUTOMATIC GRINDINGIDR POLISHING MACHINE.

SPEGIFIGATION forming part of Letters Fatent No. 741,907 dated October 20, 1903.

Application filed January 10, 1903. Serial ll'o 138,577. (No model.) i

To all whom it may concern.-

Be it known that I, ALBERT H. HATFIELD, a citizen of the United States, residing at Brockport, in the county of Monroe and State of New York, have invented a new and useful Automatic Grinding or Polishing Machine, of which the following is a specification.

My invention relates to an improvement in automatic grinding and polishing machines, and'more especially to a machine of this class adapted for polishing carriage and wagon spokes, maul and ax handles, and similar articles.

The main object of the invention is to provide a device of this character which will automatically hold the spoke or handle to the grinding or polishing surface, revolve the article being acted on, lift it from the polishingsurface, automatically releasing and depositing it at the front of the machine. I

In the accompanying drawings, Figure 1 is aside elevation of my improvement, parts thereof being broken away and others shown in section to more clearly illustrate my improvement. Fig. 2 is a planview with the top cross beam removed and the guidingstandards shown in section. Fig. 3 is an enlarged detail end view of the feed end of the machine. Figs. 4 and 5 are detail views illustrating the holder by which one end of the article being polished is held and revolved. Figs. 6 and 7 are similar views of the holder for retaining the opposite end of the article. Fig. 8 is a detailed view of one of the links in which either holder is held. Fig. 9 is a detail perspective view illustrating the device for automatically releasing the article polished and also for withdrawing the holder to the position for permitting the insertion of another article. Fig. 10 is an enlarged detail section on or about the line 10 10 of Fig. 1. Figs. 11 and 12 are detail views illustrating one of the shoes under which the chain travels, and Figs. 13 and 14 are similar views of the guiding-shoe that is employed for operat:

ried around over the polishing-belt and returned and released at the front end, and therefore the release or discharge end is the same as the feed end and is herein termedthe front end. At the rear end are pivoted standards A and adjacent these standards are shorter standards A also pivoted. Adjacent the front end are standards A rigid with the base. To these various standards are secured bearings B. (Shown fully'in Fig. 9 and require no detail description.)

' In the bearings attached to the standards A A are shafts C, carrying belt-pulleys 0 over which runs a sand-belt C of the usual construction. Secured to these standards A A working'insuitable blocks attached to the standards, are the rods D, threaded at one end and revoluble. By turning the rods the standards A are inclined toward or away from the standards A, thus loosening or tightening the sand-belt. I

To each standard A A are mounted in the bearing B two sprocket-wheels E, one above the other, and sprocket-chains E run around these wheels, a chain being on each side of the frame.

To each of the standards A is connected through the medium of a link a turnbuckle D, the buckle being connected at its lower end to a link secured to the base. By means of this bucklethe standards A can be inclined, tightening or loosening the sprocketchains.

A cross-piece A connects the upper ends of the standards A, and the standards are longitudinally recessed on their inner faces, as shown at A in Figs. 1 and 2. The side members of a vertical frame F (shown complete in Fig. 10) slide in these recesses, While the upper cross-piece F of the frame has rigidly secured to its under face shoes G, describedindetailhereinafter. The cross-piece A has a central threaded perforation in which works a threaded rod F the lower end of which is secured to the cross-piece F. By turning the hand-nut F the frame F is drawn toward or forced away from the cross-piece A thus raising or lowering the frame F.

In the sprocket-chains are secured links having perforated ears E, Fig. 8, and rev0- lubly journaled in these cars are short shafts E. In practice I place these ear bearing links at aboutevery tenth link in the sprocket chain, they being directly opposite each other in the two chains. On one side of the machine the shafts carry pinions E arranged between the ears, and the inner end of the shaft projects inside the chain and carries a rectangular holder or cap E, having asocket E opening toward the opposite chain. On the other side of the machine the shaft E is longer than the shaft Eand carries no pinion. On its outer end a cap-piece E is threaded -on it and at its end it carries a hollow cylindrical cap E opening toward the socket E and in alinement with it. A coiled spring E bears at one end against the rear of the cap E and at the opposite end against the inner ear of the link.

The shoes G are positioned parallel to and directly above the chains E, the shoes having a straight central portion and upturned ends and are bolted or secured in any desired manner to the piece F. These shoes differ slightly from each other, the shoe above the chain carrying the pinions having rack-teeth G formed alongits under surface and aflange G on the outer side. The opposite shoe has no flange and a smooth wearing under surface G The spoke or handle to be polished is held at one end in the'cap E and at the opposite end in the socket E and is of course carried around with the chain. As it passes between the shoes and the belt it is not only held firmly down, but the pinion E engaging the rack-teeth G, will be rapidly revolved, turning the spoke or handle. It is understood that the belt is also moving. To the outside of one of the standards A is secured an angled bracket H, having its shorter inwardlyprojecting arm longitudinally slotted, and over this arm fits an angled arm II, slotted also, and the two brackets are adjustably held together by the usual bolt passing through the slots and secured by a nut. The brackets are between the two bearings B carried by this standard and on the side of the chain carrying the caps E E and the bracket H carries at its inner end a curved and downwardly and inwardly inclined plate H the curved edge of the plate being toward and slanting away from the under chain. As the chain revolves, passing over the sandbelt, under the shoes, and back beneath the belt to the front of the machine, the holders and spokes or handles are carried with them and as the links having the shafts E pass the lower part of the plate H the cap E en gages the face of the plate outside the chain, and as the plate is curved to conform to the curvature of the chain and also slants away from the chain it acts as a guide-plate and draws the holder, of which the cap E is a part, out away from the cap E and the spoke falls out. Another one is inserted in its place, and when the cap reaches the end of the guide-plate the tension of the spring E draws it back into place, and the new spoke is held firmly in the same manner as the one dropped.

The forward shaft 0 carries a driven pulley I and a driving-pulley J, from which runs a belt K to a pulley K, mounted on a shaft K journaled in suitable bearings in the rear of the frame, and on this shaft is a sprocket K and above it on one of the shafts carrying the sprocket-wheels E is a sprocket-Wheel K driven by a chain K from the wheel K From the above it is evident that any one skilled in the art will understand the construction and operation of myimproved machine. 7

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A spoke-polishing machine comprising a polishing-surface, holders adapted to travel above the polishing-surface and to receive the ends of spokes, means for automatically releasing the spokes from the holders after passing the polishing-surface, and means for holding the spokes down on the polishingsurface and rotating the spoke while in contact with the polishing-surface.

2. In a polishing-machine, the combination with a polishing-surface, link chains traveling on each side of said surface, said chains comprising links having perforated ears, shafts mounted therein, cap-pieces carried by the inner ends of said shafts and adapted to receive the ends of spokes, means for holding said spokes against polishing-surface and rotating same while in contact with the said surface, and means for automatically releasing the spokes from the holder after passing over the polishing-surface.

3. In a device of the kind described, a sprocket-chain comprising links having perforated ears, shafts revolubly journaled in said ears, pinions on said shafts, caps having sockets on the inner ends of the shafts, a parallel chain having links with perforated ears, revoluble shafts journaled therein, hollow inwardly-open caps on the inner ends of the shafts, springs between the caps and the ears, flanged caps on the outer side of the last-mentioned shafts, shoes adapted to bear down on the chains, rack-teeth on one of said shoes adapted to engage the pinions carried by the shafts, and an inclined guideway adapted to engage the flanged caps and draw the hollow open caps away from the caps carried by the pinion-bearing shafts, substantially as described.

4. A device of the kind described comprising a suitable frame, a sand-belt mounted therein, sprocket-chains traveling on either side of the sand-belt, shafts carrying holders at their inner ends journaled in the links of said chains, pinions mounted on the shafts carried by one of the chains, a vertically-adjustable frame inclosing said belt and chains, shoes carried by the frame, one of said shoes having teeth on its under surface adapted to engage the pinions and rotate the holders, and

means at the forward end of the frame for shoes arranged above the chains and adapted drawing the holders of one chain away from to regulate the pressure of the spoke against the holders of the other chain. the belt.

5. In a machine of the kind described, a ALBERT H. HATFIELD. 5 polishing-belt, endless chains adapted to carry Witnesses:

spokes traveling on each side of and slightly T. S. DEAN,

above said belt, and vertically-adjustable H. C. BRAINARD. 

